I have Installed Linux Mint 13 Mate 64bit alongside Linux Mint 14 Cinnamon 64bit to replace Linux Mint 14 Mate 64bit. Now I get entries related to the old OS. I have installed Grub-customizer and removed them. But there are other entries that don't show up in Grub Customizer and still appear on tthe grub menu. Is there any command lines that can help me get rid of this mess???

### BEGIN /etc/grub.d/40_custom #### This file provides an easy way to add custom menu entries. Simply type the# menu entries you want to add after this comment. Be careful not to change# the 'exec tail' line above.### END /etc/grub.d/40_custom ###

Do you have a separate /boot partition shared between both installs? Or perhaps two disks?If not, it appears as though your other install is handling grub. Reboot into that installation and make the changes there.

That command listed above will remove the kernels it finds other than the one currently in use.I don't know about using it on a system with multiple installs.You can just run the first part to see which kernels it finds: